Inspection Procedure

1. Connect Techstream to the DLC3.
2. Turn the ignition switch on (IG).
3. Turn Techstream on.
4. Select the following menu items: Body Electrical / Main Body / Active Test.
5. Check that the relay operates.
   MAIN BODY CONTROL RANGE REFERENCE
   
   

   Tester Display	Test Part	Control Range	Diagnostic Note
   Taillight Relay	Taillight relay	ON/OFF	-

   OK: 

   Taillight relay operates. (Taillights illuminate.) 

OK: PROCEED TO NEXT CIRCUIT INSPECTION SHOWN IN  PROBLEM SYMPTOMS TABLE  

NG: Go to next step 

1. Remove the TAIL fuse from the instrument panel J/B assembly.
2. Measure the resistance of the fuse.

   Standard resistance: 

   Below 1 Ω 

NG: REPLACE FUSE 

OK: Go to next step 

1. Remove the taillight relay from the instrument panel J/B assembly.
2. Measure the resistance according to the value(s) in the table below.

   Standard resistance 

   RESISTANCE REFERENCE
   
   

   Tester Connection	Specified Condition
   3 - 5	10 kΩ or higher
   	Below 1 Ω (When battery voltage is applied to terminals 1 and 2)
   3 - 4	Below 1 Ω
   	10 kΩ or higher (When battery voltage is applied to terminals 1 and 2)

Fig 1: Inspecting Taillight Relay
Courtesy of © TOYOTA, LICENSE AGREEMENT TMS1002

NG: REPLACE TAILLIGHT RELAY 

OK: Go to next step 

1. Measure the voltage according to the value(s) in the table below.

   Standard voltage 

   VOLTAGE SPECIFICATION
   
   

   Tester Connection	Condition	Specified Condition
   IC-4 - Body ground	Light control switch OFF → TAIL	Below 1 V → 10 to 14 V
   IC-5 - Body ground	Light control switch OFF → TAIL	Below 1 V → 10 to 14 V
   ID-6 - Body ground	Light control switch OFF → TAIL	Below 1 V → 10 to 14 V
   ID-14 - Body ground	Light control switch OFF → TAIL	Below 1 V → 10 to 14 V
   IP-8 - Body ground	Light control switch OFF → TAIL	Below 1 V → 10 to 14 V

Fig 2: Identifying Instrument Panel Junction Block Assembly

Courtesy of © TOYOTA, LICENSE AGREEMENT TMS1002

OK: REPAIR OR REPLACE HARNESS OR CONNECTOR (INSTRUMENT PANEL JUNCTION BLOCK ASSEMBLY - BODY GROUND) 

NG: Go to next step 

1. Disconnect the IA instrument panel J/B assembly connector.
2. Measure the voltage according to the value(s) in the table below.

   Standard voltage 

   VOLTAGE SPECIFICATION
   
   

   Tester Connection	Condition	Specified Condition
   IA-1 - Body ground	Always	10 to 14 V

Fig 3: Identifying IA Instrument Panel J/B Assembly Connector Terminals
Courtesy of © TOYOTA, LICENSE AGREEMENT TMS1002

NG: REPAIR OR REPLACE HARNESS OR CONNECTOR 

OK: REPLACE INSTRUMENT PANEL JUNCTION BLOCK ASSEMBLY